GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 34
configure the common parameters to set the communication mode and data format
by the PROFIBUS configuration tool. The common parameters are described
below.
●
COM Port baud rate
：
2400/4800/9600/19200/38400/57600/115200
●
COM Port parity
：
None/Even/Odd
●
COM Port data length
：
7/8 data bit
●
COM Port stop bit
：
1/2 stop bit
●
Modbus Type
：
Master/Slave
●
Modbus Format
：
RTU/ASCII
●
I/O Safe Mode
：
Retain last value/Switch safe value
●
Byte Order : Little-Endian/Big-Endian
●
Output Data Mode : Manual/Auto
●
Modbus Device ID(S)
：
1~247
●
Polling Modbus Device Interval(ms) (M)
：
1~65535ms
●
Query Message Timeout Value(ms)(M)
：
1~65535ms
PS
：
a.
When stop bit of Com Port is 2, data bit of Com Port must be 7 or else stop bit
of Com Port will be set to 1.
b.
I/O Safe Mode
When GW-7552-B / GW-7552-M acts as a Modbus master (Modbus
Type=Master):
i.
Data exchange between Profibus master and GW-7552-B / GW-7552-M is
interrupted
“I/O Safe Mode” will be activated when the data exchange between
Profibus master and GW-7552-B / GW-7552-M is interrupted (e.g. no
physical connection, Profibus master leaves the data exchange mode, etc.).
I/O safe mode = “Switch Safe Value”
The GW-7552-B / GW-7552-M will set internal DIO and AIO data to
safe value and send the safe values to the Modbus slave device.
I/O safe mode = “Retain Last Value”
Internal DIO and AIO data retain last value
ii.
Connection between Modbus slave and the GW-7552-B / GW-7552-M is
interrupted
I/O safe mode = “Switch Safe Value”
The GW-7552-B / GW-7552-M will set the internal DI and AI data to
safe value and send safe values to Profibus master device.
I/O safe mode = “Retain Last Value”
